Thorn... the questions you're asking can really only be answered by individuals. And they aren't exclusively NPD behaviours.
When someone chooses to do something that will clearly hurt someone else... it means that they don't care and/or haven't thought about the other person at all. It's a lack of empathy. Or they've chosen to hurt that person intentionally for whatever reason.
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"The time has come, the Walrus said, to talk of many things. Of shoes, of ships, of sealing wax, of cabbages, of kings! Of why the sea is boiling hot, of whether pigs have wings..."
"I have a problem with low self-esteem. Which is really ridiculous when you consider how amazing I am.
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